Question by YoungDeveloper · Jul 01, 2016 at 05:49 PM · device unique unique-identifiers deviceuniqueidentifier

Is deviceUniqueIdentifier actually unique?

I've read many threads and posts in which people have problems using deviceUniqueIdentifier, either it changes if device it switched between wifi and mobile data and/or other reasons. But almost all of those posts are from 2011-2013. Is it safe to say that deviceUniqueIdentifier is actually unique per device in 2016?

I'd like to use it as a user - device identifier (key) in database for non authenticated users (play store and gamecenter), if it can change for whatever reason, it's unacceptable and cannot be used, thanks.

edit: My target devices are ios and android smartphones.

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tanoshimi · Jul 02, 2016 at 12:34 PM 0

It would help if you referenced the many threads and posts you're referring to - the documentation page you linked to says "guaranteed to be unique for every device" so, if there's evidence that's not the case you should report it as a bug.